i have built a big bang r1 by changing the cam arrange-ment, thus giving me a dyno curve the same as a 90 degree twin and better than any duke but with the running abilities of a inline four i need to know has anyone one eles done this and if so would they contact me or does anyone one know where there is a web site for this. if anyone one has any tuning problems plaese email me i might be able to help.
rick007@blueyonder.co.uk
(dyno technician brands hatch performance)

welcome aboard first of all :hellobye

Are you for real? have you tried the bike on a dyno? You gotta give us the charts!

If this works it would be awesome! A lot of work?

What's not working that you need help with?

thanks for the reply
when i return to work i will copy the dyno charts and if you send me your email i will send them to you, this has been done on a race r1 that has had no prior tuning and the dyno graphs are like the song they make you go hmmmm but on short bursts in our car park the thing is very lively just like a v twin.
my email is
rick007@blueyonder.co.uk

Rick007,

When you say like a V-Twin do mean less Hp and broader torque. :confused:

I read something similar somewhere, only it was a CBR600. The conclusion was that it was a waste of time and money, but that the guy who did it (Rick?) deserved a lot of credit for trying.

well i have done it with an r1 and did not do it with a cbr but would like to know more of what they did with the cbr.
my scanner is shagged and can only give you the vague scan of the dyno graph against a tl 1000r to show you the torque that is gained, once we have tested this bike on the track and it works then what we might do is make a kit form with all instuctions on how do do this and if you remember from my first encounter with this forum it's all done without taking the engine out and can be put back to how it was in less 4 hour's for the home mechanic. what we are trying to do is give you more just jet kits and bolt on goodies but give you a kit that will take less time to get drunk and make a bike that people look at and hear and say "what the hell was that it looked like an r1 but souned like a twin and did it go or what" so with what we are doing could if it works be good for you guy's and we will do it cheap to stop biker's being ripped off (yet again)
iam new to all this forum and needle stuff so please be patient or phone me in the uk on 01474879331 and i will be happy to talk (be esier than my scanner ) or i can fax dyno sheets and set ups on most sports bikes.

iam here to help the fellow biker and stay in a job, so advice is free and all the dyno sheets i can put my hands on.

yours with a tear rick007

Rick! I found the magazine. Itīs issue 84 (March ī98) of Fast Bikes magazine. Rob Frost (the supersport 600 rider, you know...) rode it. It doesnīt say who built it, other than that his name is Irvine. If Iīm not mistaken Fast Bikes are in London somewhere, maybe they can fill you in on the details, or put you in touch with Irvine the Bigbang-man.

Good luck.

Just finding the magazine to look at, yes i know rob frost. Here are the dyno sheets i promised

here is a dyno sheet with the big bang up against an sp1, look at the mid range torque miles better than sp1

here is one up against the tl1000r

and this is one against the duke 996 sps

any thoughts or comments?

What about power? Is it the same, better or worse than a stock R1? Vibration?

Rick007? What about power and vibration?

i"m wondering what you mean exactly by simulating a big bang engine?

i mean,this is in relation to the firing order of the pistons,it doesnt have much to do with camshafts...and probably only available on twins and v-whatever engines.

if this is a test,you failed ;)

if not,tell us more!:eek:

... To add in simple terms, the pistons need to fire alomst simaltainiously in order to operate as a big bang engine. This would require an new, completly redesigned Crank Shaft as well as new, completly redesigned cams.....

The thumping sound of a v-twin is related to the crank angle between the cylinders, it doesn't have to be a v-twin to have this crack angle however. Take the trx850 for instance, it's a parallel twin that sounds like a v-twin because of its 270 degree crank angle.

On another note, a stock r1 makes more power and torque than stock 1 thou v-twins at just about all points in the rev range.

My 2 cent. ;)

My 2 cents are the reasone twins are so fast in Superbike racing (other than the major $$$ thrown at them compared to 4 cylinders) is they hold a 250cc advantage. They also have a broader spread of torque and the microsecond between each piston firing helps the tire hook back up to the ground, So on a roadrace track a twin will jump off the corners much better than a 4. Of course, this only happens with big hp bikes, you'll never go faster out of a corner on a bike (suspension and chassis design and setups aside) with 2 cyclinders compared to 4 when we're talking 140 rwhp. That's why in grand prix screamers were used and then when hp got high enough they switched to big bang. And to preserve tires.